Vibrator



Filed Nov.v 2, 1945 Dec. 28, 1948.

R. o, s'ToKl-:s TAL Y 2,457,413 l vIgRATon l 3- Sheets-Sheet 1 Dec. 28, 1948. o. s'roKs ETAL VIBRATOR Filed Nov.. 2, 1945 3 Sheets-Sheet 2 R. o. sToKEs ETAL 2,457,413

vnannon n 4 s sheets-sheet :s

l I, m wv M4N o www w @wm L.. mgm? U NN h Tm .uh Q @Q Nh mh ILIMN owwi QW m. www O O o o o @o n mw @v .Whg

Dec. 2s, 194s.

Filed Nov. 2, 1945 Patented Dec. 28, 1948 VIBRATOR Rupert Octavius Stokes and George Kopp, London, England Application November 2, 1945, Serial No. 626,282 In Great Britain November 1, 1944 section 1, PublicLaw 69o, August s, 1946 Patent expires November 1, 1964 The invention relates to vibrators and has been devised primarily in connection withV the vibrating screens disclosed in co-pending application Serial No. 626,281, led November 2, 1945, but can be used for other purposes, as will be mentioned later.

According to the invention the vibrator comprises two bearings spaced apart, a rotary member mounted in the bearings and having a portion between the bearings adapted to swing away from the straight line joining the bearings to constitute an out-of-balance weight, a driving connection for applying power to the portion of the rotary member running in one bearing, and means for transmitting torque at starting from the last-named portion to the portion running in the other bearing. f

Without the last named element, i. e., some torque transmitting means, a flexible out-ofbalance rotary member might twist itself up instead of acting in the desired manner. If the rotary member has sufficient torsional rigidity to overcome the friction of ythe bearing remote from the drive end, this member may itself constitute the torque transmitting means, especially if it is tensioned to lie approximately in a straight line when stationary.

The invention is illustrated by three forms of construction shown in the accompanying drawings, in which the three figures are longitudinal sections through the. three vibrators.

Figure 1 shows a vibrator intended to run at 2,000 R. P. M. and having an 8 ounceweight running at a maximum radius of 3 inches", which gives a pull of 170 lbs.

A vibrator is contained in a thin steel tubey or roller I, about 3 feet long and 8 inches diameter. At a short distance in from each end radial parts such as closure discs 2, 2 are welded in the roller I and carry central trunnions 3, 4 to support main ball bearings 5, 6. At the right hand end, which may be referred to asthe drive` end, the ball bearing 5 carries in its inner race a fitting 1 at one end of a torque tube 8. The latter is a thin metal tube extending practical-ly the whole length of the roller I and open at the lower side in the position shown over the greater part of its length. The fitting 1 comprises a cup-shaped part iitting into the bearing 5 and holding the end of the torque tube by an anchor pin 9. It also comprises a shaft part I0.

The trunnion 3 is extended to carry-a ball bearing I l on its outer end, on the `outer race of which is fixed a grooved sheave I2gfor a c ord 8 Claims. (Cl. 74-87) l drive. The sheave I2 is also tight on the end of the shaft I 0.

At the left hand end, which may be called the adjustment end, the bearings is not mounted direct in the trunnion 4 but in a sliding housing I3 adapted to move longitudinally Within the trunnion 4. The housing I3 is connected to a central adjustment spindle I4, the outer end of which is threaded overV a considerable length. The trunnion 4 has a projecting part to enclose the spindle I4, and at the end a nut I5 screwed to fit the spindle is rotatably iixed by a yflange on the inside and a hand wheel I6 on the outside. A lock nut I1 secures the adjustment made by rotating the hand wheel I6.

The housing I3 has the ball bearing 6 xed inside it, and the inner race of the bearing has an anchor bush I8 fixed into it which can slide on the torque tube 8. 'An anchor pin I9 is iitted transversely inside the anchor bushv I8 and passes through longitudinal slots 20 in the torque tube 8.

A weight bar 2| about /q inch diameter and rather over 7 inches long lies parallel to the roller axis. Its twoends are hinged to tension strips 22, 22 about 121/2 inches long, which are themselves hinged to the two anchor pins 9 and I9. Adjustment by means of the hand wheel I5 can move the weight bar 2I from its maximum radius of revolution at 3 inches from the centre of the roller I to a position practically at the centre. The out-of-balance effect can thereby be varied to suit circumstances.

When the sheave I2 is driven, the torque tube 8 ensures that the anchor bush I8 and its pin I9 will revolve at the same speed as the pin 9 and its tting 1. The weight bar 2I will thus revolve in the manner of a skipping rope and provide the out-of-balance'effectdesired. The chain-dotted rectangles 23, 23 denote supports forthe structure to permit it to rotate, e. g., on a lter drum, so that it does not always hit the drum along the same generatrix.

The arrangement shown in Figure 2 differs from that of Figure 1 in that the torque tube' is omitted and the adjustment of the stroke is effected at the drive end. A tube or roller lI encloses the mechanism and has a plate 24 xed in each end. By the wedging action of conical surfaces a bearing housing 25 and a trunnion 26 are xed to the plate 24 at the right hand or blind end. The'trunnion has a spherical portion 21, by which it is attached to a support as in the Acase of Figure 1. A ball bearing 28 in the housing 25 journals a hub 2,9, which is thusv free to rotate.

At the left hand or driving end a trunnion 3B is Xed to the plate 24 by the wedging action of` conical surfaces with the aid of a loose flange 3l. The trunnion 3i? has a spherical portion 32 by which'it alsoA is `attached tox the support; roi-1er fis tseu In vadditi'on the sa and theliiiifi" l race of the bearing 34 supportwafzquiljl3v,lwhiph kis integral with a grooved driving sheave 38.` MA-n anchor cup 39 can slide longitudinallywiri the quill 3l' but is not capable of rotatiehiwflatop, to the quill. An eccentric Weight^2l `is'lf'iing at its two ends to tension strips 22, 22,

turn are hinged by arihor pins 4G, @Si to the' anchor'cup 3,9andfthelfhub 2 9 respectively. l, '1

An adjustment plunger lll is screwed-intosthe quilt-31 yandf. is shown ri-n the positionior i'rriaxif` rnum-fswing of f the yweight 521'. For 2a; reduced radiusV of :sw-ing the iplunger f4! -fcancbeunsrewed andy its "adjustment zxdv-byyaqlockplateaux kAjn adjustment `bolt 43 is fixed-togthe canchor-cupland'lcan-fsl-ide in :the plunger 4 l., ,Ingitssextreme right-handr position -showntin 'the :figure I.a flange 44-0nthe boltJlBabuts :against .iinternalfshouidarin-the plunger 54|, and1tlf1is is' theposition assumed operation +A resetting spring 45 bears'on the angeMand-*on ani-internal afnge atftheferid -vof lthesfrplunger mi vwhich'.plishes ethe bolt i3 to the leftqha'ndwhengthefvibratoryis stationary-and-the'rebyzsetstle weight l-gandthe strips-221m af'pia'ctically"straight fline between the bearings. yWhen -starting from rest @the rigidity of thewei-ght and strips-fand r their #joints Figure 'This'farrangeinentfis'ioiiiarticularlise Y gagmet and can be .rotated eyrneansif capstan. heeiies rorizaryfitsf'axiai posi en; jas

4 has fixed in its inner race an inner adjustment sleeve 61 capable of sliding along the quill 62. The bearing 66 through the other parts just described forms a second journal for the quill 62. in anhor yis adapted to slide axially in the qu G'Zfand islfd byfafpin 6G to the sleeve 51. Two""`slts'opposite each other in the quill 62, one ro i which is shown at 19, permit the anchor 68 "and the pin 69 to have the required range of An extension shaft 'H on the ancooperates by its end with an extension po n of the anchor 68.

i'chalri'-13ofwthefsame kind as a driving chain resetting anchorf and at the other end to the .`s.zli"iiusing 15 nxed to the quin e2 Kcarries a jockey pinion l5, which engages the chain '113 and is so positioned that the portion of chain 'between it andjthe anchor 5B lies along the' aXisf/.ofzthe-ibearings :Aniecceritric' 'weight fl 'I tofthe resetting end. When running, the vpini-ll' always occupies the position shown in the figure; whichis-determined 'by y-the abutment Tof :the plunger 5,4 onthefend ofthe 'quil1'53-' Thejoickey pinionv \16 also--occupiesfa :fixed position irrespectiye-oi-fany adjustment-ofthe sleeve 6d to var -the Aoutonf-balance eiiect. v.The weight 11'!v therefere always 4swings f, at the same .position idway between these two supports.

clientjweightlitselij-to act as the out-of-balance Wegma=catenarypfshap-e when-revolving.- The .rad-ius .centre of gravity smaller than .the di-'p is; sed, ,vt'h'e slopefoi the tangentsto the elatf'enary at rthe anchor pins -greeter thanr the slope of the straightv lines Vjoining theanchor ings s `considerably less.

f `thefroller l orittings is '4 uch-less than l.that `dii-Aan eccentricfshalftw ich would vbe required for the saine wide vibrating screen, an eccentric shaft V*would serious-,problemsdue to critical speeds,

Y whichfwouldfag'ain .increase the mass to be setin Govibrtion. l ,I v .y

. 'lellnember voffth'fe kind'ehvisaged is made tjq atepy @vibrator f bhehiuherto 'known einel nissnrtenough not to invoiveprineai SU Vdpr the"r r`irriberitse1f has 'to be', 'ade r1 and ence avy, lsoa'sto vibrate withtlie "qu`ill*"6'2 to form an indicator for the r In thisarrangement IYthe `chain assu-Ines f efch'ain, which involves larger .housingseor is with an its the powerdenia'nded of `the'vibrator very rigid, with the result of a saving in both Weight and driving power.

Even where the member to be vibrated is narrow the invention will still show an economy in power owing to the smaller Weight of the roller and the consequently smaller dead Weight to be vibrated.

Besides the use of the invention on a vibrating screen as mentioned above, it can be used for tamping, for vibrating concrete moulding boxes, and for other like applications. One interesting application is to a filter drum.

What We claim is:

1. A vibrator for a reciprocating structure, comprising a substantially cylindrical casing including substantially radial parts near the respective ends of the casing, a bearing on each radial part coaxial with the casing, an axially movable member mounted to rotate in a first of said bearings, an elongated member mounted by one of its ends for rotation in the sec-nd of said bearings and mounted by its other end on said axially movable member, both ends of said elongated member being mounted in the bearing axis and Said elongated member normally lying in the bearing axis but being capable of flexing to bring the major part of it out of said axis when the axially movable member moves toward said second bearing, thereby to constitute an out-oibalance weight, and a driving member connected to one end of said elongated member.

2. A vibrator for a reciprocating structure, comprising a substantially cylindrical casing, a closure member near each end of the casing, a bearing in each closure member coaxial with the casing, an axially movable member mounted to rotate in a first of said bearings, an elongated member mounted by one of its ends for rotation in the second of said bearings and mounted by its other end on said axially movable member, said elongated member normally lying in the bearing axis but being capable of flexing to bring the major part of it out of the axis when the axially movable member moves towards said second bearing, thereby to constitute an out-ofbalance weight, a driving member connected to an end of the elongated member and projecting beyond the associated bearing, and means for transmitting the driving torque to the opposite end of the elongated member.

3. A vibrator for a reciprocating structure, comprising a substantially cylindrical casing, a closure member near each end of the casing, a bearing in each closure mem-ber coaxial with the casing, an axially movable member mounted to rotate in a first of said bearings, an elongated member mounted by one of its ends for rotation in the second of said bearings and mounted iby its other end on said axially movable member, said elongated member normally lying in the bearing axis but being capable of flexing to bring the major part of it out of the axis when the axially movable member moves towards said second bearing, thereby to constitute an out-of-balance weight, a driving member connected to an end of the elongated member and projecting beyond the associated bearing, and a tube journalled in the two bearings with positive driving connections to both ends of the elongated member.

4. A vibrator for a reciprocating structure, comprising a substantially cylindrical casing, a closure member near each end of the casing, a bearing in each closure member coaxial with the casing, an axially movable member mounted to rotate in a first of said bearings, an elongated `member mounted by one of its ends for rotation in the secondl of said bearings and mounted by its other end on said axially movable member, said elongated member normally lying in the bearing axis but being capable of flexing to bring the major part of it out of the axis when the axially movable member moves towards said second bearing, thereby to constitute an out-ofbalance weight, a driving member connected to an end of the elongated member and projecting beyond the associated bearing, and resilient means applying tension to the elongated member and tending to bring it into an axial position, the elongated member having sufficient torsional rigidity to transmit the torque from the driving connection to the end of the elongated member remote from the driving connection.

5. A vibrator for a reciprocating structure, comprising a substantially cylindrical casing, a closure member near each end of the casing, a bearing in each closure member coaxial with the casing, an axially movable member mounted to rotate in a first of said bearings, an elongated member assembly mounted by one of its ends for rotation in the second of said bearings and mounted by its other end on said axially movable member, said elongated member assembly consisting of three rigid portions pivotally connected end to end and normally lying in the bearing axis with the ends pivotally connected to their supporting members but being capable of swinging out of the axis by the action of the pivots to constitute an out-of-balance Weight, a driving member connected to an end of the elongated member assembly and projecting beyond the associated bearing, and means for transmitting the driving torque to the opposite end of the elongated member assembly.

6. A Vibrator for a reciprocating structure, comprising a substantially cylindrical casing, a closure member near each end of the casing, a bearing in each closure member coaxial with the casing, an axially movable member mounted to rotate in a rst of said bearings, an elongated member mounted by one of its ends for rotation in the second of said bearings and mounted by its other end on said axially movable member, said elongated member normally lying in the bearing axis but being capable of flexing to bring the major part of it out of the axis when the axially movable member moves towards said second bearing, thereby to constitute an out-of-balance weight, a driving member connected to an end of the elongated member and projecting beyond the associated bearing, an abutment to limit the movement of said axially movable member towards the second bearing, and means for adjusting the axial position of the abutment, whereby the maximum movement of the elongated member away from the axis may be Varied.

'7. A vibrator for a reciprocating structure comprising a substantially cylindrical casing, a closure member near each end thereof, a bearing in each closure member coaxial with the casing,

a tubular member rotatable in one bearing, a

support member movable axially in the tubular member, resilient means urging the said support member away from the other bearing, a second tubular member rotatable in the other bearing, a support member movable axially in the said second tubular member, adjustment means positively determining the axial position of the lastnamed support member, driving means for imparting rotation to one of the tubular members, and a chain connected by its two ends to the ,mimmo o 7-8 :two evsupportimembers to .lifein :the `,ms when ITED. l TES, E'stat'oarary:andto'swing outof the axis when UN STA *PATENTS rotated, Numlznr Nam-e l Date 138. :A Vibratorzas i'dene'd iin Valajim v.'7 A:11a-172mg 'a 1,071,706 "Combs kSepig 2, 1913 ywei-A1111'susjprerld.ed on the 'chain ,by ya isprocket p5 1,583,640 ZtZerman May 4, 1926 f sofas to rbe `freely movable 'onlthe v'chain inthe FOREIGN PATENTS axial' direction.

.RUPERT -OCTAVIUSSTOKE Number -C011111'Y Date' GEQRGE KOPR 51,561 -Grea1t Brta-in Mar. '15,1893 v lo 410,105 Great-Britain May 24,1934 REFERENCES CITED 1 1291768 Germany May 22; 1901 '.'FIh *following Teferences are vof rec'or inthe vfe :idf 'this "patint: 

